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All Journal JTTM: Jurnal Terapan Teknik Mesin IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Ridwan Abdul Hakim
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Aerospace Engineering Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Termal Lemari Es dengan Variasi Jenis dan Ketebalan Isolasi di Iklim Tropis Muhammad Azril Rahmaditya; Boni Sena; Farradina Choria Suci; Ihsan naufal firdaus; Faishal Dzaky Al Hakim; Dimas Bahrudin; Ridwan Abdul Hakim; Muhamad Ilham Saputra
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.418

Abstract

Cutting speed is a crucial parameter in the turning process that significantly affects the final quality of the workpiece surface. This study aims to evaluate the impact of cutting speed variations on the surface roughness level of AISI 1018 steel. The machining process was carried out using a chisel with a tip radius of 1.2mm, and the cutting speed was varied at three levels, namely 42m/min, 66m/min, and 105m/min. Surface roughness measurements were carried out using a Surface Roughness Tester. The experimental results showed that increasing cutting speed tended to decrease surface roughness. The lowest roughness value of 2.224 μm was obtained at a cutting speed of 105 m/min. This phenomenon occurs because, at higher cutting speeds, cutting forces and vibrations are reduced, making the machining process more stable and producing better surface quality. This study shows that cutting parameters play an important role in optimizing the final results of conventional turning processes.
Thermal performance analysis of PCM-integrated freezer systems using numerical simulation Sena, Boni; Muhamad Faturrahman Al Hafizh; Muhammad Penta Helios; Muhammad Azril Rahmaditya; Rinaldi Suzatmiko; Dimas Bahrudin; Pratikara Herlambang; Ridwan Abdul Hakim; Nadia Amanah; Nurnida Elmira Othman
JTTM : Jurnal Terapan Teknik Mesin Vol 7 No 2 (2026): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v7i2.1992

Abstract

Improving temperature stability in household freezers is an important aspect of energy conservation in refrigeration systems. One approach is the integration of Phase Change Materials (PCM) as thermal energy storage media. This study aims to design and analyze the thermal performance of a PCM-integrated freezer system using cooking oil and paraffin wax as candidate PCM materials. The refrigeration system was designed using R290 refrigerant and analyzed using CoolTools software for vapor compression cycle simulation and ANSYS Student for transient thermal simulation based on the Finite Element Method (FEM). The thermodynamic analysis produced an actual COP of 2.94 from the CoolTools simulation and a calculated thermodynamic COP of 3.27, indicating acceptable refrigeration performance under low-temperature operating conditions. The transient thermal simulation results showed that paraffin wax did not exhibit a distinct temperature plateau during the transient heating process, indicating that latent heat effects were not dominant within the simulated operating temperature range. Cooking oil demonstrated a faster thermal response due to its relatively higher effective thermal conductivity, whereas paraffin wax provided better temperature stabilization and delayed heat transfer behaviour. The results demonstrate that the thermophysical properties of PCM significantly influence heat transfer characteristics and temperature distribution inside the freezer compartment. Therefore, selecting PCM materials with appropriate latent heat capacity and thermal conductivity is essential for improving temperature stability and reducing temperature fluctuations in refrigeration systems.
Co-Authors Boni Sena Dimas Bahrudin Faishal Dzaky Al Hakim Farradina Choria Suci Ihsan naufal firdaus Muhamad Faturrahman Al Hafizh Muhamad Ilham Saputra Muhammad Azril Rahmaditya Muhammad Penta Helios Nadia Amanah Nurnida Elmira Othman Pratikara Herlambang Rinaldi Suzatmiko Sena, Boni